What about the grammar?
"Everyone is wearing hats." OR "Everyone are wearing hats." OR "Everyone is wearing a hat."

"Everybody is going to the prom." OR "Everybody are going to the prom."

Are these considered singular or plural? "Everybody is going to the prom" seems right to me, meaning that "everybody" is singular. But "Pass these flyers out to everybody so that they will know the location of the prom" also seems right, and in that, "everybody" is plural.